Fix Notes JS

Also fixes #1983

app/assets/javascripts/main.js.coffee

@@ -58,25 +58,6 @@ $ ->
     $(@).next('table').show()
     $(@).remove()
 
-  # Note markdown preview
-  $(document).on 'click', '#preview-link', (e) ->
-    $('#preview-note').text 'Loading...'
-
-    previewLinkText = if $(@).text() is 'Preview' then 'Edit' else 'Preview'
-    $(@).text previewLinkText
-
-    note = $('#note_note').val()
-
-    if note.trim().length is 0
-      $('#preview-note').text 'Nothing to preview.'
-    else
-      $.post $(@).attr('href'), {note: note}, (data) ->
-        $('#preview-note').html(data)
-
-    $('#preview-note, #note_note').toggle()
-    e.preventDefault()
-    false
-
 (($) ->
   _chosen = $.fn.chosen
   $.fn.extend chosen: (options) ->